4 ms·
What if you used the noise as the carrier wave for the signal? Like, if in an urban area you have a "stable" probability distribution of noise, modulate that.
by angel_j 8y ago
What if you used the noise as the carrier wave for the signal? Like, if in an urban area you have a "stable" probability distribution of noise, modulate that.
- Robin_Message 8y agoYou're being downvited because, whilst this is a clever sounding idea, unfortunately it doesn't work like that. The noise is random, so you can't modulate it because you can't predict what it will be. A probability distribution isn't enough; say you want to modulate by XORing with a random, uniformly distributed stream of zeros and ones. Knowing that distribution doesn't enable the receiver to extract the data. (Fun fact: GPS signals are under the noise floor, but detectable because they are encoded with a predictable pseudorandom carrier which can be found even in the noise.)
- angel_j 8y agoCould you... modulate the amplitude of the PD?
- lapinot 8y agoAmplitude is about power, that what you want to minimize. If you can affect the amplitude of the noise, that means your signal has high amplitude: you have a high signal-to-noise ratio (SNR) and you already have won.
- eleitl 8y agoDo you know why digital pulse radios never happened?